How to create Mapping rules for custom entities in EF6?

Yes, there is a better option that allows you to map your courses in another method. I certainly think so. You may add this mapper OnModelCreating and construct mapper for your model, which inherits the generic EntityTypeConfiguration. By doing this, your code will remain clean and managing mappings for a large number of models will be considerably simpler.

Typical class:

public class Person
{
    public int Id { get; set; }
    public string FullName { get; set; }
    public int Age { get; set; }
}

Mapper type:

internal class PersonMap
    : EntityTypeConfiguration<Person>
{
    public PersonMap()
    {
        // Primary key
        this.HasKey(m => m.Id);

        // Properties
        this.Property(m => m.FullName)
            .HasMaxLength(50);      

        // Table & column mappings
        this.ToTable("TABLE_NAME", "SCHEMA_NAME")
        this.Property(m => m.Id).HasColumnName("ID");
        this.Property(m => m.FullName).HasColumnName("FULL_NAME");
        this.Property(m => m.Age).HasColumnName("AGE");

        // Relationship mappings
        // Map your naviagion properties here if you have any.
    }
}

Then you add a mapper to the method OnModelCreating:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Configurations.Add(new PersonMap());

    base.OnModelCreating(modelBuilder);
}